source: trunk/server/source4/kdc/pac-glue.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 7.8 KB
RevLine 
[745]1/*
2 Unix SMB/CIFS implementation.
3
4 PAC Glue between Samba and the KDC
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
7 Copyright (C) Simo Sorce <idra@samba.org> 2010
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22*/
23
24#include "includes.h"
25#include "../libds/common/flags.h"
26#include <ldb.h>
27#include "auth/auth.h"
28#include "auth/auth_sam_reply.h"
29#include "kdc/kdc-glue.h"
30#include "param/param.h"
31#include "librpc/gen_ndr/ndr_krb5pac.h"
32
33static
34NTSTATUS samba_get_logon_info_pac_blob(TALLOC_CTX *mem_ctx,
35 struct auth_user_info_dc *info,
36 DATA_BLOB *pac_data)
37{
38 struct netr_SamInfo3 *info3;
39 union PAC_INFO pac_info;
40 enum ndr_err_code ndr_err;
41 NTSTATUS nt_status;
42
43 ZERO_STRUCT(pac_info);
44
45 nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx, info, &info3);
46 if (!NT_STATUS_IS_OK(nt_status)) {
47 DEBUG(1, ("Getting Samba info failed: %s\n",
48 nt_errstr(nt_status)));
49 return nt_status;
50 }
51
52 pac_info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
53 if (!mem_ctx) {
54 return NT_STATUS_NO_MEMORY;
55 }
56
57 pac_info.logon_info.info->info3 = *info3;
58
59 ndr_err = ndr_push_union_blob(pac_data, mem_ctx, &pac_info,
60 PAC_TYPE_LOGON_INFO,
61 (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
62 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
63 nt_status = ndr_map_error2ntstatus(ndr_err);
64 DEBUG(1, ("PAC (presig) push failed: %s\n",
65 nt_errstr(nt_status)));
66 return nt_status;
67 }
68
69 return NT_STATUS_OK;
70}
71
72krb5_error_code samba_make_krb5_pac(krb5_context context,
73 DATA_BLOB *pac_blob,
74 krb5_pac *pac)
75{
76 krb5_data pac_data;
77 krb5_error_code ret;
78
79 /* The user account may be set not to want the PAC */
80 if (!pac_blob) {
81 return 0;
82 }
83
84 ret = krb5_data_copy(&pac_data, pac_blob->data, pac_blob->length);
85 if (ret != 0) {
86 return ret;
87 }
88
89 ret = krb5_pac_init(context, pac);
90 if (ret != 0) {
91 krb5_data_free(&pac_data);
92 return ret;
93 }
94
95 ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
96 krb5_data_free(&pac_data);
97 if (ret != 0) {
98 return ret;
99 }
100
101 return ret;
102}
103
104bool samba_princ_needs_pac(struct hdb_entry_ex *princ)
105{
106
107 struct samba_kdc_entry *p = talloc_get_type(princ->ctx, struct samba_kdc_entry);
108 uint32_t userAccountControl;
109
110
111 /* The service account may be set not to want the PAC */
112 userAccountControl = ldb_msg_find_attr_as_uint(p->msg, "userAccountControl", 0);
113 if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
114 return false;
115 }
116
117 return true;
118}
119
120/* Was the krbtgt an RODC (and we are not) */
121bool samba_krbtgt_was_untrusted_rodc(struct hdb_entry_ex *princ)
122{
123
124 struct samba_kdc_entry *p = talloc_get_type(princ->ctx, struct samba_kdc_entry);
125 int rodc_krbtgt_number;
126
127 /* Determine if this was printed by an RODC */
128 rodc_krbtgt_number = ldb_msg_find_attr_as_int(p->msg, "msDS-SecondaryKrbTgtNumber", -1);
129 if (rodc_krbtgt_number == -1) {
130 return false;
131 } else if (rodc_krbtgt_number != p->kdc_db_ctx->my_krbtgt_number) {
132 return true;
133 }
134
135 return false;
136}
137
138NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
139 struct hdb_entry_ex *client,
140 DATA_BLOB **_pac_blob)
141{
142 struct samba_kdc_entry *p = talloc_get_type(client->ctx, struct samba_kdc_entry);
143 struct auth_user_info_dc *user_info_dc;
144 DATA_BLOB *pac_blob;
145 NTSTATUS nt_status;
146
147 /* The user account may be set not to want the PAC */
148 if ( ! samba_princ_needs_pac(client)) {
149 *_pac_blob = NULL;
150 return NT_STATUS_OK;
151 }
152
153 pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
154 if (!pac_blob) {
155 return NT_STATUS_NO_MEMORY;
156 }
157
158 nt_status = authsam_make_user_info_dc(mem_ctx, p->kdc_db_ctx->samdb,
159 lpcfg_netbios_name(p->kdc_db_ctx->lp_ctx),
160 lpcfg_sam_name(p->kdc_db_ctx->lp_ctx),
161 p->realm_dn,
162 p->msg,
163 data_blob(NULL, 0),
164 data_blob(NULL, 0),
165 &user_info_dc);
166 if (!NT_STATUS_IS_OK(nt_status)) {
167 DEBUG(0, ("Getting user info for PAC failed: %s\n",
168 nt_errstr(nt_status)));
169 return nt_status;
170 }
171
172 nt_status = samba_get_logon_info_pac_blob(mem_ctx, user_info_dc, pac_blob);
173 if (!NT_STATUS_IS_OK(nt_status)) {
174 DEBUG(0, ("Building PAC failed: %s\n",
175 nt_errstr(nt_status)));
176 return nt_status;
177 }
178
179 *_pac_blob = pac_blob;
180 return NT_STATUS_OK;
181}
182
183NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
184 krb5_context context,
185 krb5_pac *pac, DATA_BLOB *pac_blob)
186{
187 struct auth_user_info_dc *user_info_dc;
188 krb5_error_code ret;
189 NTSTATUS nt_status;
190
191 ret = kerberos_pac_to_user_info_dc(mem_ctx, *pac,
192 context, &user_info_dc, NULL, NULL);
193 if (ret) {
194 return NT_STATUS_UNSUCCESSFUL;
195 }
196
197 nt_status = samba_get_logon_info_pac_blob(mem_ctx,
198 user_info_dc, pac_blob);
199
200 return nt_status;
201}
202
203/* this function allocates 'data' using malloc.
204 * The caller is responsible for freeing it */
205void samba_kdc_build_edata_reply(NTSTATUS nt_status, DATA_BLOB *e_data)
206{
207 PA_DATA pa;
208 unsigned char *buf;
209 size_t len;
210 krb5_error_code ret = 0;
211
212 if (!e_data)
213 return;
214
215 pa.padata_type = KRB5_PADATA_PW_SALT;
216 pa.padata_value.length = 12;
217 pa.padata_value.data = malloc(pa.padata_value.length);
218 if (!pa.padata_value.data) {
219 e_data->length = 0;
220 e_data->data = NULL;
221 return;
222 }
223
224 SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
225 SIVAL(pa.padata_value.data, 4, 0);
226 SIVAL(pa.padata_value.data, 8, 1);
227
228 ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
229 free(pa.padata_value.data);
230
231 e_data->data = buf;
232 e_data->length = len;
233
234 return;
235}
236
237/* function to map policy errors */
238krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
239{
240 krb5_error_code ret;
241
242 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
243 ret = KRB5KDC_ERR_KEY_EXPIRED;
244 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
245 ret = KRB5KDC_ERR_KEY_EXPIRED;
246 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
247 ret = KRB5KDC_ERR_CLIENT_REVOKED;
248 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
249 ret = KRB5KDC_ERR_CLIENT_REVOKED;
250 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
251 ret = KRB5KDC_ERR_CLIENT_REVOKED;
252 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
253 ret = KRB5KDC_ERR_CLIENT_REVOKED;
254 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
255 ret = KRB5KDC_ERR_POLICY;
256 else
257 ret = KRB5KDC_ERR_POLICY;
258
259 return ret;
260}
261
262/* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
263 * for consistency */
264NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
265 const char *client_name,
266 const char *workstation,
267 bool password_change)
268{
269 TALLOC_CTX *tmp_ctx;
270 NTSTATUS nt_status;
271
272 tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
273 if (!tmp_ctx) {
274 return NT_STATUS_NO_MEMORY;
275 }
276
277 /* we allow all kinds of trusts here */
278 nt_status = authsam_account_ok(tmp_ctx,
279 kdc_entry->kdc_db_ctx->samdb,
280 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
281 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
282 kdc_entry->realm_dn, kdc_entry->msg,
283 workstation, client_name,
284 true, password_change);
285
286 talloc_free(tmp_ctx);
287 return nt_status;
288}
289
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